• 主题
高级搜索  >
历史搜索 清空历史
首页> 美国卫生研究院文献>The Journal of Physiology >In vivo measurements of the triceps surae complex architecture in man: implications for muscle function
【2h】

In vivo measurements of the triceps surae complex architecture in man: implications for muscle function

机译：人体三头肌肱三头肌复杂结构的体内测量：对肌肉功能的影响

代理获取
本网站仅为用户提供外文OA文献查询和代理获取服务，本网站没有原文。下单后我们将采用程序或人工为您竭诚获取高质量的原文，但由于OA文献来源多样且变更频繁，仍可能出现获取不到、文献不完整或与标题不符等情况，如果获取不到我们将提供退款服务。请知悉。
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

class="enumerated" style="list-style-type:decimal">The objectives of this study were to (1) quantify experimentally in vivo changes in pennation angle, fibre length and muscle thickness in the triceps surae complex in man in response to changes in ankle position and isometric plantarflexion moment and (2) compare changes in the above muscle architectural characteristics occurring in the transition from rest to a given isometric plantarflexion intensity with the estimations of a planimetric muscle model assuming constant thickness and straight muscle fibres.The gastrocnemius medialis (GM), gastrocnemius lateralis (GL) and soleus (SOL) muscles of six males were scanned with ultrasonography at different sites along and across the muscle belly at rest and during maximum voluntary contraction (MVC) trials at ankle angles of −15 deg (dorsiflexed direction), 0 deg (neutral position), +15 deg (plantarflexed direction) and +30 deg. Additional images were taken at 80, 60, 40 and 20% of MVC at an ankle angle of 0 deg.In all three muscles and all scanned sites, as ankle angle increased from −15 to +30 deg, pennation increased (by 6–12 deg, 39–67%, P < 0.01 at rest and 9–16 deg, 29–43%, P < 0.01 during MVC) and fibre length decreased (by 15–28 mm, 32–34%, P < 0.01 at rest and 8–10 mm, 27–30%, P < 0.05 during MVC). Thickness in GL and SOL increased during MVC compared with rest (by 5–7 mm, 36–47%, P < 0.01 in GL and 6–7 mm, 38–47%, P < 0.01 in SOL) while thickness of GM did not differ (P > 0.05) between rest and MVC.At any given ankle angle the model underestimated changes in GL and SOL occurring in the transition from rest to MVC in pennation angle (by 9–12 deg, 24–38%, P < 0.01 in GL and 9–14 deg, 25–28%, P < 0.01 in SOL) and fibre length (by 6–15 mm, 22–39%, P < 0.01 in GL and 6–8 mm, 23–24%, P < 0.01 in SOL).The findings of the study indicate that the mechanical output of muscle as estimated by the model used may be unrealistic due to errors in estimating the changes in muscle architecture during contraction compared with rest.
机译：class =“ enumerated” style =“ list-style-type：decimal”> <！-list-behavior =枚举前缀-word = mark-type = decimal max-label-size = 0-> 这项研究的目的是（1）对踝关节位置和等距足底屈曲力矩的响应，对人的肱三头肌复合体中垂体角度，纤维长度和肌肉厚度的体内实验变化进行定量；以及（2）比较在从静止到给定的等距足底屈曲强度的过渡过程中出现的肌肉结构特征之上，其中平面肌模型的估计假定恒定的厚度和直肌纤维。 腓肠肌内侧（GM），腓肠肌外侧（GL）在静止和最大自发性收缩（MVC）试验期间，在-15度（背屈方向），0度（中性）的踝角处，通过超声检查对六只男性和比目鱼（SOL）肌肉进行了超声检查，分别沿肌肉腹部和跨肌肉腹部的不同部位进行了扫描位置），+15度（pla ntarflexed方向）和+30度。当踝角从-15度增加到+30度时，在所有三块肌肉和所有扫描部位，分别以MVC的80％，60％，40％和20％的角度拍摄图像。 ，垂垂度增加（静止时增加6–12度，39-67％，静止时P <0.01，MVC期间，垂度增加9–16度，29-43％，P <0.01），纤维长度减少（减少15-28 mm，32- 34％，静止时P <0.01，MVC期间8-10 mm，27-30％，P <0.05）。与静止相比，MVC期间GL和SOL的厚度增加（分别增加5–7 mm，36–47％，GL中的P <0.01和SOL中的6–7 mm，38–47％，P <0.01），而GM的厚度增加了在静止和MVC之间没有差异（P> 0.05）。 在任何给定的踝角处，模型都低估了从静止到MVC的垂线角度（9-12度，纤维长度（24–38％，在GL和9–14度中P <0.01，25–28％，在SOL中P <0.01）和纤维长度（在GL和6–9中为6–15 mm，22–39％，P <0.01 8 mm，23–24％，在SOL中P <0.01）。 研究结果表明，所用模型估算的肌肉机械输出可能由于估算变化的误差而不现实与休息相比，肌肉结构在收缩过程中的变化。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
代理获取

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号